DTC P0455: EVAP Serious Leakage In System: Notes
WARNING: This page is about a different car, the 2003 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
Before this DTC can be set, the cold start diagnosis and then the ordinary must first be carried out. The engine coolant temperature must be below 40°C (104°F) when the engine is started to achieve this. A DTC can therefore not be generated if the engine is warm when started.
To perform a final check on a rectified fault, use the activating command on the diagnostics tool so that the cold start test is performed irrespective of the starting temperature.